/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.metrics;



import com.bff.gaia.metrics.*;



/** Helper for pretty-printing {@link Metric Gaia metrics}. */

public class Metrics {

  public static String toString(Metric metric) {

    if (metric instanceof Counter) {

      return Long.toString(((Counter) metric).getCount());

    } else if (metric instanceof Gauge) {

      return ((Gauge) metric).getValue().toString();

    } else if (metric instanceof Meter) {

      return Double.toString(((Meter) metric).getRate());

    } else if (metric instanceof Histogram) {

      HistogramStatistics stats = ((Histogram) metric).getStatistics();

      return String.format(

          "count=%d, min=%d, max=%d, mean=%f, stddev=%f, p50=%f, p75=%f, p95=%f",

          stats.size(),

          stats.getMin(),

          stats.getMax(),

          stats.getMean(),

          stats.getStdDev(),

          stats.getQuantile(0.5),

          stats.getQuantile(0.75),

          stats.getQuantile(0.95));

    } else {

      throw new IllegalStateException(

          String.format(

              "Cannot remove unknown metric type %s. This indicates that the reporter "

                  + "does not support this metric type.",

              metric.getClass().getName()));

    }

  }

}